The hypothesis is that in the treatment of low back pain (LBP) radiating to the leg, the long term results of prolotherapy are more effective than those of the current conventional treatment: epidural steroid injections (ESI). This research will examine the efficacy of prolotherapy injections versus epidural steroid injections for the treatment of low back pain radiating to the leg. This is a randomized, unblinded study, in which patients seen in the principle investigator's pain clinic will be randomly divided to receive treatments from either the experimental, prolotherapy group, or the active control, ESI group.